Merge pull request #178 from altheaden/amend-pr-checklist

Update PR template to add documentation-related checks

.github/pull_request_template.md

@@ -8,6 +8,9 @@ Below are a few things we ask you or your reviewers to kindly check.
 ***Remove checks that are not relevant by deleting the line(s) below.***
 -->
 Checklist
+* [ ] Developer's Guide has been updated
+* [ ] API documentation in the Developer's Guide (`api.md`) has any new or modified class, method and/or functions listed
+* [ ] Documentation has been [built locally](https://docs.e3sm.org/mache/main/developers_guide/building_docs.html) and changes look as expected
 * [ ] `Testing` comment in the PR documents testing used to verify the changes
 
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